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JPS54179080

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DESCRIPTION JPS54179080
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are explanatory views of the prior art,
FIG. 3 and FIG. 4 are explanatory views of one embodiment of a piezoelectric buzzer according to
the present invention, and FIG. FIG. 6 is an exploded explanatory view of the piezoelectric buzzer
according to the present invention, showing a state in which the envelope of the other
embodiment of the piezoelectric buzzer is removed. 1 ······· Elastic thin plate, 11 ············ Container
elastic thin plate, 2 ° 12 ········ Piezoelectric plate, 3, 13 ·············· Piezoelectric buzzer envelope, =
15 ····· Electric parts, 16 · · · · · · · · · · · · · · · · · · · · · · annular groove, 23 · · · · · · · · · · · · · · · · · · · · · · · · · ·
························································································
· · · · · · · · · · · · · · · Openings, 25 ..... Elastic film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer provided with a sounding body which has a piezoelectric plate attached to an elastic thin
plate and converts expansion vibration of the piezoelectric plate into bending vibration of the
elastic thin plate. In the conventional piezoelectric buzzer, the piezoelectric plate 2 is adhered to
a flat elastic thin plate 1 to form a sounding body, as shown in FIG. A-1: As shown in FIG. As
shown in Fig. 2, the sound generator is fixed to the front end of the annular projection 4
provided on the inner wall with an adhesive or the like, and the sound generating body is
attached to the inner wall of the piezoelectric buzzer envelope 3 at its periphery. Fix with
adhesive or the like. In these cases, since the sounding body needs to be fixed so that its vibration
is not impeded, an adhesive having a certain degree of flexibility is used in practice, so it is not
always sufficient in terms of adhesive strength. I could not say that. As described above, since the
sounding body must be fixed inside the envelope 3, the workability is poor, and further, the
performance of the piezoelectric buzzer is not largely changed by the application method of the
adhesive (2) The purpose of the present invention, which has drawbacks, is to solve such
drawbacks of the prior art, and to provide a piezoelectric buzzer which is easy to assemble, stable
in operation, stable in performance, and resistant to adverse environments. is there. Hereinafter,
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as shown in FIG. 3 and FIG. 4 according to the present invention, in the present invention, the
elastic thin plate 11 is formed into a container shape by drawing a metal conductor, for example,
using a mold. It is molded into a container shape by molding or by laminating a metal conductor
foil on a film made of organic material or organic material, and formed into a container shape,
and the piezoelectric plate 12 is integrally bonded to the inner bottom portion. As a result, the
sound generator is constructed, and the elastic thin plate 11 also functions as one of the
electrodes of the piezoelectric plate 12 functionally. In FIG. 3, a conductor pattern and a
container-like elastic thin plate are provided on the outer edge of the circuit board 16 by
inserting the circuit board 16 on which the electric component 15 constituting the oscillation
circuit is mounted inside such a container-like sounding body. The low melting, white metal,
conductive adhesive, etc. are connected simultaneously with the inscribed part 11 of 11, and the
connection like snow and mechanical connection are simultaneously made from (3). The elastic
thin plate inscribed in the circuit board 16 and the inscribed portion 17 of 111 may be bent to
be used for positioning for mounting the circuit board 16. It is also possible to press-fix the
circuit board 16 into the inside of the container-like sounding body by selecting the outer
diameter size of the circuit board 16 and the inner diameter size of the sounding body within a
predetermined range. In the case of Fig. 4, a part of the container-like elastic thin plate 11 is bent
inward-the remaining part is bent outward, and the inward bending portion 18 is melted to the
conductor pattern on the circuit board 16, 6 Electrical and mechanical connections are made,
such as with metal or conductive adhesive.
As shown in Fig. 3 and 4 and 4 in Fig. 4 and Fig. 4 and Fig. 4 and Fig. 4 and 4, since the electric
component 15 constituting one oscillation circuit is mounted on the circuit board 16 and then
electrically and mechanically connected to one sound generator. As compared with the
conventional assembling method as shown in Fig. 1 and Fig. 2 the workability is remarkably
improved. Furthermore, as shown in Fig. 3 and 4 in Fig. 4 (4) an annular groove 20 is provided
on the periphery of the inner bottom of the container-like elastic thin plate 11-this annular
groove 20 The performance is further improved, and the workability at the time of attaching the
piezoelectric plate 12 is also facilitated. That is, since the piezoelectric plate 12 is fixed to and
integrated with the elastic thin plate 11, the spreading vibration of the piezoelectric plate 12 is
converted into the bending vibration of the elastic thin plate 11, and this bending vibration
becomes a node of the annular groove 20. The vibration loss is significantly reduced compared to
the conventional fixing methods with adhesives as shown in FIGS. 1 and 2; In particular, in the
case of FIG. 3, when the piezoelectric plate 12 is attached, excess adhesive flows out to the
annular groove 20, and the adhesive layer on the piezoelectric plate bonding surface can be
made uniform at all times C, practically It is extremely effective. The container-like elastic thin
plate 11 shown in FIG. 4 f has an annular ridge 21 provided on the inside of the annular groove
20. The annular ridge 21 plays the role of positioning when the piezoelectric plate 12 is
attached, and when the amount of adhesive applied to the piezoelectric plate 12 can be
controlled by other means, this annular ridge 21 is used. The ridges 21 are also very effective (5).
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Such a speaker and circuit board 16 is housed in the piezoelectric buzzer envelope 13. A
continuous elastic thin plate 11 is positioned at a portion facing the sound wave emitting hole 23
of the piezoelectric buzzer, thereby protecting the piezoelectric plate 12, the air component 15,
the circuit board 16 and the like. The working opening 24 is generally protected to some extent
from being fixed to a wall surface or the like in use. In particular, when it is desired to ensure the
protection of the work opening 24, as shown in FIG. 5, the piezoelectric plate 12 is attached and
the circuit board 16 on which the one air component 15 is mounted is inserted into the elastic
thin plate container 11. Then, it may be enclosed with an elastic film 25. For example, the
conductor hole 26 is left and sealed by an elastic film 25 such as a heat shrinkable film or a
rubber elastic film. In this case, all of the piezoelectric plate 12 and the oscillation circuit, etc. are
completely protected by the elastic thin plate container 11 and the elastic film 25. Therefore, for
household appliance such as washing machine, fire alarm for kitchen etc., outdoor 6) The
piezoelectric buzzer is protected from dust, oil droplets, raindrops, dirty water, smoke, etc. in
many applications such as r, vehicle applications, etc., the life can be remarkably extended and
the reliability can be greatly improved.
In this way, since it is easy to make it completely waterproof, it can also be used as an
underwater acoustic wave oscillator. Fig. 16 shows the piezoelectric buzzer of the present
invention disassembled into each part-from this figure, the workability of assembly becomes
better as compared with the prior art, and the environmental resistance is improved. Will be
understood. The present invention is a piezoelectric buzzer configured as described above, and
since the sounding body can be fixed at the work opening of the envelope, the assembly becomes
extremely easy, and the variation in performance due to the difference in the amount of the
adhesive applied is small. Because it operates stably, and the piezoelectric plate and the
oscillation circuit are housed in a container-like elastic thin plate-many excellent practical effects
such as reliable operation for a long time under adverse environment is there.
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